What is included in the 3-tier maintenance regime?

19-07-2019

The three-tier system divides responsibilities for track maintenance as follows: 1. On-Track Machines (OMU). Mechanized maintenance (see above) including systematic tamping, intermediate tamping, shoulder ballast cleaning, ballast profiling and redistribution, track stabilization, and periodic deep screening of ballast. 2. Mobile Maintenance Units (MMU). These are of two types. MMU-I refer to the permanent way units that are assigned to deal with spot tamping, in-situ rail welding, casual renewal and repairs, overhaul of Level Crossings, glued joint replacement, and machining of rails including cutting, drilling, grinding and chamfering. Normally there is one MMU-I unit for each Permanent

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What are CONCOR container consists?
July 16, 2019

CONCOR is the organization that handles container traffic in India. More details here. CONCOR has about 1905 BLC type low-bed wagons for fast container traffic. CONCOR also plans to acquire new 45-foot wagons to carry 22-foot domestic containers as well as 45-foot international containers, and also to take over some BRN wagons from IR and convert

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What other forms of train working are used on IR other than the block system?
July 16, 2019

Following trains system In this system, trains are worked between two stations by dispatching them one after the other (all in the same direction) at specific intervals (generally at least 15 minutes). The trains are run at specific speeds (less than 25km/h). This ensures that there should only be one train in every 5km stretch in the section

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What is the ‘authority to proceed’?
July 16, 2019

Authority to proceed is the formal name for the permission or authorization that allows a driver to take a train into a section of track, in either block or non-block systems of working. It is also known as train working authority. In places where token block instruments are in use, block tokens constitute the authority to proceed. Normally in

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What is Permissive Block (or Absolute Permissive Block) Signalling?
July 16, 2019

Normally, in Absolute Block Signalling, the single-line section between points where sidings or loops are provided must be treated as a single block in order to prevent two trains from entering it at the same time. However, this also reduces track utilization in the case of trains following one another in the same direction. In these cases, a

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What is Automatic Block Signalling? (What is the Automatic Block system?)
July 16, 2019

In Automatic Block Signalling (ABS) the signals are automated and operate in conjunction with track circuiting or other means of detecting the presence of a train in a block section. As of March 2003, IR had 3,606 kms of track under the ABS system. When a train enters a block section, the stop signal protecting that block changes automatically

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What is Controlled Manual Block?
July 16, 2019

Controlled Manual Block is a system where a manually operated block instrument is used for obtaining the Line Clear permission from the station in advance; however, the clearance of the section must first be verified through track circuiting. The block instrument is connected to the track circuits, and it is not possible for Line Clear to be

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